I’ve never used this piece of software (and their web site is remarkably uninformative about what it does, besides transform my enterprise), but from the commen

I’ve never used this piece of software (and their web site is remarkably uninformative about what it does, besides transform my enterprise), but from the comments it looks like some kind of search engine. It wouldn’t be too surprising to have a bunch of heuristics that try to extract meaning from unlabeled strings. Indeed, while viewing that very page, my iPad turned several of the epoch timestamps into telephone numbers. So I don’t know if this is what actually happened, but this is a plausible reason for having such a regex that does not depend on stupidity: a “guess what this number could mean” routine written around 2015 might make include finding Unix timestamp-ish values not more than a few years into the future. I’d still be pretty unhappy with the hard coded magic number approach and wish to see the specific requirements documented, along with some sort of tunable parameter for the range, as well as a test that verifies it works for the given requirements. Which gets into a fun and potentially philosophical exercise as well, since a test that passed yesterday should pass today, but this might be one case where “doesn’t fail with dates less than 5 years into the future” is a reasonable request.